Dennick was selected to compete at the 2020 Summer Olympics in the 800 metres.[1] He was also given the honour of being the flag bearer for his nation in the opening ceremony.[2] In the race itself, Luke finished eighth in his qualifying heat after falling to the ground after being clipped by another athlete. He finished in a time of 1.54:30.[3][4]
Luke's personal best on 800 m is also the national record. He ran 1:48.22 at the National Stadium, Kingston, Jamaica on 11 June 2022, breaking the 11-year-old record of Erison Hurtault, who ran 1:48.60 in 2011.[5] Luke competed at the 2022 Commonwealth Games in Birmingham, England, finishing sixth in his 800m heat in a time of 1:50.06.[6] He was a bronze medalist in the 800 metres at the 2023 NACAC U23 Championships in Costa Rica.[7]
He competed in the 800 metres at the 2024 Summer Olympics in Paris in August 2024, where he ran a new national record time of 1:46.81.[8]
He ran the national record in the 400 metres hurdles of 48.82 seconds in placing fourth overall at the 2025 NACAC Championships in Freeport, The Bahamas in August 2025.[9] He competed at the 2025 World Athletics Championships in the men's 400 metres hurdles in Tokyo, Japan, in September 2025, running 49.32 without reaching the semi-finals.[10]
